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Unimodal Response of Soil Methane Consumption to Increasing Nitrogen Additions
- Source :
- Environmental sciencetechnology. 53(8)
- Publication Year :
- 2019
-
Abstract
- Nitrogen (N) status has a great impact on methane (CH4) consumption by soils. Modeling studies predicting soil CH4 consumption assume a linear relationship between CH4 uptake and N addition rate. Here, we present evidence that a nonlinear relationship may better characterize changes in soil CH4 uptake with increasing N additions. By conducting a field experiment with eight N-input levels in a Tibetan alpine steppe, we observed a unimodal relationship; CH4 uptake increased at low to medium N levels but declined at high N levels. Environmental and microbial properties jointly determined this response pattern. The generality of the unimodal trend was further validated by two independent analyses: (i) we examined soil CH4 uptake across at least five N-input levels in upland ecosystems across China. A unimodal CH4 uptake-N addition rate relationship was observed in 3 out of 4 cases; and (ii) we performed a meta-analysis to explore the N-induced changes in soil CH4 uptake with increasing N additions across global upland ecosystems. Results showed that the changes in CH4 uptake exhibited a quadratic correlation with N addition rate. Overall, we suggest that the unimodal relationship should be considered in biogeochemistry models for accurately predicting soil CH4 consumption under global N enrichment.
- Subjects :
- Consumption (economics)
China
Alpine-steppe
Nitrogen
Field experiment
Biogeochemistry
chemistry.chemical_element
General Chemistry
010501 environmental sciences
01 natural sciences
Methane
chemistry.chemical_compound
Soil
Animal science
chemistry
Soil water
Environmental Chemistry
Environmental science
Ecosystem
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15205851
- Volume :
- 53
- Issue :
- 8
- Database :
- OpenAIRE
- Journal :
- Environmental sciencetechnology
- Accession number :
- edsair.doi.dedup.....369d8761b2e0c235c51773c54e92bdb7